| 摘要 |
A device (10) for treating obstructions in vessels or small openings in the body, comprising a rotatable ablator tip (16) which is guided to the obstruction in a reduced diameter configuration, expanded and rotated to remove the obstruction, and contracted to remove the device from the body. The variably expandable abrasive tip coil (16) in one embodiment is actuated by piston means within the coil. A pair (28, 50) of collars is attached to the ends of the coil (20), and the piston effects relative longitudinal axial movement of the collars and the respective ends of the coil tip. When the ends of the coil tip are so moved, expansion and contraction of the diameter of the coil tip results. In another embodiment, the expansion tip coil is actuated by an expandable and contractible bellows disposed within the coil. In another embodiment, the expansion and contraction of the coil tip are effected by longitudinal axis movement of an internal coil attached to one end of the coil tip, within an outer coil attached to its other end.
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